Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 2 | * \file drm_auth.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * IOCTLs for authentication |
| 4 | * |
| 5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| 6 | * \author Gareth Hughes <gareth@valinux.com> |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com |
| 11 | * |
| 12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
| 13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| 14 | * All Rights Reserved. |
| 15 | * |
| 16 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 17 | * copy of this software and associated documentation files (the "Software"), |
| 18 | * to deal in the Software without restriction, including without limitation |
| 19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 20 | * and/or sell copies of the Software, and to permit persons to whom the |
| 21 | * Software is furnished to do so, subject to the following conditions: |
| 22 | * |
| 23 | * The above copyright notice and this permission notice (including the next |
| 24 | * paragraph) shall be included in all copies or substantial portions of the |
| 25 | * Software. |
| 26 | * |
| 27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 33 | * OTHER DEALINGS IN THE SOFTWARE. |
| 34 | */ |
| 35 | |
| 36 | #include "drmP.h" |
| 37 | |
| 38 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | * Find the file with the given magic number. |
| 40 | * |
| 41 | * \param dev DRM device. |
| 42 | * \param magic magic number. |
| 43 | * |
| 44 | * Searches in drm_device::magiclist within all files with the same hash key |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 45 | * the one with matching magic number, while holding the drm_device::struct_mutex |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | * lock. |
| 47 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 48 | static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 50 | drm_file_t *retval = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | drm_magic_entry_t *pt; |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 52 | drm_hash_item_t *hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 54 | mutex_lock(&dev->struct_mutex); |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 55 | if (!drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { |
| 56 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); |
| 57 | retval = pt->priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 59 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | return retval; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Adds a magic number. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 65 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * \param dev DRM device. |
| 67 | * \param priv file private data. |
| 68 | * \param magic magic number. |
| 69 | * |
| 70 | * Creates a drm_magic_entry structure and appends to the linked list |
| 71 | * associated the magic number hash key in drm_device::magiclist, while holding |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 72 | * the drm_device::struct_mutex lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 74 | static int drm_add_magic(drm_device_t * dev, drm_file_t * priv, |
| 75 | drm_magic_t magic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | drm_magic_entry_t *entry; |
| 78 | |
| 79 | DRM_DEBUG("%d\n", magic); |
| 80 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 81 | entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); |
| 82 | if (!entry) |
| 83 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | memset(entry, 0, sizeof(*entry)); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 85 | entry->priv = priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 87 | entry->hash_item.key = (unsigned long)magic; |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 88 | mutex_lock(&dev->struct_mutex); |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 89 | drm_ht_insert_item(&dev->magiclist, &entry->hash_item); |
| 90 | list_add_tail(&entry->head, &dev->magicfree); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 91 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Remove a magic number. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 98 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | * \param dev DRM device. |
| 100 | * \param magic magic number. |
| 101 | * |
| 102 | * Searches and unlinks the entry in drm_device::magiclist with the magic |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 103 | * number hash key, while holding the drm_device::struct_mutex lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 105 | static int drm_remove_magic(drm_device_t * dev, drm_magic_t magic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | drm_magic_entry_t *pt; |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 108 | drm_hash_item_t *hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | DRM_DEBUG("%d\n", magic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 112 | mutex_lock(&dev->struct_mutex); |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 113 | if (drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { |
| 114 | mutex_unlock(&dev->struct_mutex); |
| 115 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
Thomas Hellstrom | 8669cbc | 2006-08-07 22:22:10 +1000 | [diff] [blame^] | 117 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); |
| 118 | drm_ht_remove_item(&dev->magiclist, hash); |
| 119 | list_del(&pt->head); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 120 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); |
| 123 | |
| 124 | return -EINVAL; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Get a unique magic number (ioctl). |
| 129 | * |
| 130 | * \param inode device inode. |
| 131 | * \param filp file pointer. |
| 132 | * \param cmd command. |
| 133 | * \param arg pointer to a resulting drm_auth structure. |
| 134 | * \return zero on success, or a negative number on failure. |
| 135 | * |
| 136 | * If there is a magic number in drm_file::magic then use it, otherwise |
| 137 | * searches an unique non-zero magic number and add it associating it with \p |
| 138 | * filp. |
| 139 | */ |
| 140 | int drm_getmagic(struct inode *inode, struct file *filp, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 141 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
| 143 | static drm_magic_t sequence = 0; |
| 144 | static DEFINE_SPINLOCK(lock); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 145 | drm_file_t *priv = filp->private_data; |
| 146 | drm_device_t *dev = priv->head->dev; |
| 147 | drm_auth_t auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 149 | /* Find unique magic */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | if (priv->magic) { |
| 151 | auth.magic = priv->magic; |
| 152 | } else { |
| 153 | do { |
| 154 | spin_lock(&lock); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 155 | if (!sequence) |
| 156 | ++sequence; /* reserve 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | auth.magic = sequence++; |
| 158 | spin_unlock(&lock); |
| 159 | } while (drm_find_file(dev, auth.magic)); |
| 160 | priv->magic = auth.magic; |
| 161 | drm_add_magic(dev, priv, auth.magic); |
| 162 | } |
| 163 | |
| 164 | DRM_DEBUG("%u\n", auth.magic); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 165 | if (copy_to_user((drm_auth_t __user *) arg, &auth, sizeof(auth))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return -EFAULT; |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Authenticate with a magic. |
| 172 | * |
| 173 | * \param inode device inode. |
| 174 | * \param filp file pointer. |
| 175 | * \param cmd command. |
| 176 | * \param arg pointer to a drm_auth structure. |
| 177 | * \return zero if authentication successed, or a negative number otherwise. |
| 178 | * |
| 179 | * Checks if \p filp is associated with the magic number passed in \arg. |
| 180 | */ |
| 181 | int drm_authmagic(struct inode *inode, struct file *filp, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 182 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 184 | drm_file_t *priv = filp->private_data; |
| 185 | drm_device_t *dev = priv->head->dev; |
| 186 | drm_auth_t auth; |
| 187 | drm_file_t *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 189 | if (copy_from_user(&auth, (drm_auth_t __user *) arg, sizeof(auth))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | return -EFAULT; |
| 191 | DRM_DEBUG("%u\n", auth.magic); |
| 192 | if ((file = drm_find_file(dev, auth.magic))) { |
| 193 | file->authenticated = 1; |
| 194 | drm_remove_magic(dev, auth.magic); |
| 195 | return 0; |
| 196 | } |
| 197 | return -EINVAL; |
| 198 | } |